Added a CHECK to ensure pointers given to SetAlignedPointerInInternalField are correctly aligned.
Added a CHECK to ensure pointers given to
SetAlignedPointerInInternalField are correctly aligned.

google/gjstest,aungzanbaw/gjstest,google/gjstest,aungzanbaw/gjstest,google/gjstest,google/gjstest,aungzanbaw/gjstest,aungzanbaw/gjstest